Ilia, a Deltan from the planet Delta IV, had been romantically involved with Willard Decker, who also later served aboard the Enterprise. She did, however, swear an oath of celibacy upon initiation of her service, a requirement for Deltans entering Starfleet.

Although Ilia was eliminated by a probe from the V'Ger entity, V'Ger created another probe that was an artificial near-duplicate of her to collect information and ease communications between V'Ger and the "carbon units" that "infested" the Enterprise. The probe mentioned that the Ilia unit was "no longer functioning". The duplicated Ilia probe was similar to Ilia down to the molecular structure, as a medical exam later revealed. The probe included both her memories and personality, though both suppressed by V'Ger's programming.

When Spock entered V'Ger's interior wearing a thruster suit, he saw a representation of Ilia floating in the expanse and attempted a mind meld.

Ilia, as well as her relationship with Willard Decker, was the inspiration for both the Betazoid character Deanna Troi and Troi's relationship with the humanWilliam T. Riker. This also includes the Betazoids named after an Greek alphabet like the Deltans, the Betazoids' relatively very open attitude toward sexual activities, and Troi along with the rest of the Betazoids' ESP (Extra Sensory Perception) capability.

In the DVD commentary for the Director's Cut, director Robert Wise suggests Ilia was a last-minute replacement for the unnamed transporter accident victim who was killed earlier with Commander Sonak. Decker's surprised reaction at her arrival seems to support this.

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